Yakn-dkessikg fkame



'Ll-Mis?? N. PETERS. PHOTO-LIYMOGRAPHEH, WASHINGTON D G Unir STS

YARN-DRESSING FRAME.

Specification of Letters Patent No.

To all whom t may concern.'

Be it known that I, ABNER J. SUTHER- LAND, of Lowell, in the county ofMiddlesex and Commonwealth of Massachusetts, have invented certain newand useful Improvements in the Friction Let-Off Motion of Yarn-Beams onDressers and Similar Machines; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings and to the letters of referencemarked thereon.

Figure l, represents the plan of a frame, holding a yarn beam which hasmy improved friction-let-off-motion attached. Fig. 2, is a frontelevation of the same, and Fig. 3, is an end elevation of it.

Similar letters of reference in each of the several figures indicatecorresponding parts.

The nature of my invention consists in the addition of such improvementsto the common friction-let-o, as shall make it self regulating.

A, Figs. l, 2 and 3, represents the frame which supports the yarn beam.As my invention relates simply to the method of controlling the beam, itis unnecessary to show the whole machine on which the beam is used;-therefore, this frame A may be considered as a detached portion of theframe of a dresser or similar machine.

B, is the beam with the yarn or war wound about it, and represented byblue lines.

C, is the friction strap, one end of which is fastened by means of ahook to the frame A. The other end, after being passed over the barrelof the beam, is attached to one end of a spiral spring D. The other endof this spring is fastened to the short arm of the regulating lever E. t

F, is a stand attached to the frame, and carrying a stud on which thelever E, vibrates.

fy, is the long arm of the lever E, and is provided at its extremitywith a shoe, friction plate or roll, which presses against the roll ofyarn, wound on the beam.

IVe will now suppose the beam to be full of yarn and the action of themachine to which it is attached begins to unwind it. It

is evident that if we allow the friction on 14,120, dated January 15,1856.

the barrel of the beam to be the same, it will require a less amount oftension or stretch of the yarn or warp to revolve the beam on its axiswhen it is nearly or quite full, than when it is nearly empty,-because,while the force exerted on the barrel is the same, the force exerted bythe yarn must be constantly increased on account of the loss ofleverage, by the diminishing in the size of the roll as the yarn isunwound. But my improvements obviate this difficulty in the followingmanner, viz: 'When the beam is full of yarn the long arm y of the leverE is pressed down, and consequently the short arm, m, is also down, andcauses the spring D, to exert its greatest force on the friction strapC. In this position then, when the yarn has its greatest advantage ofleverage by reason of the beams being full, the spring is made to exertits greatest force on the friction strap C. Now when the beam is empty,or nearly so, this advantage is lost; but it is compensated for by aless amount of friction of th-e strap on the barrel; for, as the yarnunwinds, the end of the long arm of the lever E, pressing against theroll, rises; which causes the short arm to rise, and lessens the tensionof the spring. Thus it will be seen that in the proportion by which thepower of the yarn diminishes to overcome the friction, in just the sameratio the friction is diminished; so that the two forces are thusequalized throughout the whole unwinding of the yarn, and consequentlyan equal tension of the warp is maintained, which is very essential tothe making of good and perfect cloth.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is:

I claim the use and application of a lever or its equivalent, one end ofwhich presses on the surface of the yarn wound about the beam, and tothe other end of which, the friction spring is attached for the purposeand substantially as herein described.

I am aware that James and John Haworth obtained a patent in 1848 for acontrivance acting on the same principle as that above described; butthat contrivance was applicable only to looms, and could not withoutmaterial modieationbe applied to dressers. In Witness whereof I havehereunto set I do not claim the use of my let off motion my signaturethis 17th day of July A. D. as applied to looms, but only as applied to1855. dressers and similar machines, excepting ABNER J. SUTI-IERLAND.

5 looms. I do not claim the friction strap, In presence o nor the spiralspring, as they have been used AARON S. HADLEY,

before. O. E. CUSHING.

